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Is debian/patches/do-not-hardcode-gcc necessary at all? Variable initialisations like this in make are overridable on make's command line, so your change to debian/rules should be sufficient without that additional patch.

Perhaps this is because the previous upload used a wrong version number? 1build2 indicates a no-change rebuild, which means the archive auto-sync would happily clobber it with a new version from Debian; and the new build log is for a -2 version, suggesting this is what happened.